Sheet metal screws



(No Model.) 6 Sheets-Sheet 1.

W. WERTS.

MACHINE FOR THREADING SHEET METAL SCREWS.

No. 291,656, Patented Jan. 8, E1884.

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(No Model.) 6 Sheets-Sheet 3.

W. WERTS. V MACHINE FOR THREADING SHEET METAL SCREWS. No. 291,656. I Patented Jan. 8, 1884.

WITNESSES: INVENTOR 4M, 20am.

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(No Model.) 6 Sheets-Sheet 4.

'w. WERTS. MAGHINE FOR THREADING SHEET METAL SCREWS.

'No. 291,656. Patented Jan. 8, 1884.,

INVENTOR (No Model.) 6 Sheets-Sheet 6.

w. WERTS.

MACHINE FOR THREADING SHEET METAL SCREWS. No. 291,656. Patented Jan. 8, 1884.

NITED TATES trio.

arena WILLIAM wears-or CAMDEN, NEWJERSEY.

SPECIFICATION forming part of Letters Patent No. 291,656, dated January 8, 1884.

Application filed May 31, 1883.

To all whom itmcty cancer/7,:

Beit known that I, WILLIAM NVnRTs, a citizen of the United States, residing at Gamden, in the county of Camden and State of New Jersey, have invented a new and useful Improvement in Machines for Threading Sheet- Metal Screws, of which the following is a specification. I i

The nature of my invention consists of a series of screw-threadingdevices in combination with disks on a central revolving shaft, and with mechanism for bringing the sheet-metal blanks continuously to the chucks to be threaded, and discharging them therefrom when the screw-threads have been formed, substantially as described in the body of the specification, and set forth in theclaims.

. In the accompanying drawings, which make a part of this specification, Figure 1 is a plan view of my improved machine. Fig. 2, Sheet N o. 2, is a front elevation of the same. Fig. 3, Sheet No. 3, is an endelevation at the right of the machine. Fig. 4 is a side view of the face-plate G, at the right hand,and devices connected therewith for giving movements to the chucks J, J, and J, in combination with other devices hereinafter described, the view being taken at the line 00 m of Fig. 2. Fig. 5, Sheet No. 4, is a side elevation ofthe face-plate 0, taken at the line 3 y of Fig. 2, the pinion E being connected therewith. Fig. 6 is a section, on an enlarged scale, of a pair of plungers, S and S, and a hopper, It, connected to faceplate O. 7 is a longitudinal section of a stripper, T,a portion of a plunger, S, and cap K. Fig. 8, Sheet No. 5, is a perspective view of one of the eccentricsL, in connection with a left-hand threading-chuck, J. Fig. 9 is a side elevation of the sprocket-wheel Q, chain 1?, having buckets It, and sheet-metal blank K, and a portion of the disk 0. Fig. 10 is a plan View of the same. Fig. 11 is a perspective view of a sheet-metal-cap blank, K. Fig. 12 is a perspective view of a finished cap, K Fig. 13 is a side elevation of one of thebuckets It and a portion of the endless chain P. Figs. 14 and 15 are respectively the top view of a bucket, R, andface view of ahopper-finger, g. Fig. 16 is a section of a front elevation of the machine.

(No model.)

Like letters of reference in all the figures in dicate the same parts.

A and A represent the pedestals of the shaft B, which carries the face-plate 0, disk 0, (to which are connected the hoppers hereinafter describech) and the disk 0 and which disks, in connection with the face-plate, support the shafts D D D and shafts D D at opposite sides of each shaft D. The shafts D, at their right-hand end, are provided with pinions E,which gear into internal gear-teeth of the ring G, whereby the shafts are revolved in the direction of the arrows, while central shaft, B, and disks revolve in opposite directions, the movement being given by means of the driving-shaft B, which has a pinion, E, that'gears into the teeth of the face-plate G, the shaftbeing journaled in the pedest-als'A A, and having a pulley, H,overwhich a belt, I, )asses and connects with the-motive power.

In practice I have any desirable number of shafts D, but have shown only three, which have in combination shafts D D, one at each side, connected therewith by means of pinions E E, which gear into the pinions E of the shafts D, whereby the shafts D are revolved in opposite direction to that of the shafts D.

At the outer side of each shaft D there is an eccentric, F, which has its bearing in the faceplate O, there being a longitudinal hole at one side for the shaft D for the axial movements of the latter. On the inner ends of the eccentrics there are gear-wheels G, and on the shafts D pinions 13*, which gear into them.

On the outer ends of the shafts D and D there are screw-threading chucks J and J for threading the blank-caps K, one of which is shown in Fig. 11,.the chucks J being right hand and the chucks J left hand, which thereby match in the revolutions of the shafts for forming the screw-threads of the caps K, one of which is shown in Fig. 12'.

In order to admit of the chucks J receding from the chucks J far enough for the blanks K to be placed thereon for threading, the shafts D are cut apart, as represented in the drawings, and connected together by means of universal joints L. The gear-wheels G are pivoted at one side by means of screws 0 to the face-plate O, to admit of a partial turn of the eccentrics F, and with each shaft D is con-' nected a lever, M, by means of an eye through the latter, the lever being permanently connected to the pinion E", which has a loose fit on the shaft. To one end of the lever is connected the tensionsprin g d, which draws it into the position at the points a: m, Fig. 4, whereby the chucks J J are removed a short distance from the chuck J, to admit of a blank, K, being placed thereon to be threaded. N is an arch, which has a cam, c, for operating the lever M to throw it into the position seen at the point y of said figure, it retaining that position by means of the concentric from the cam c to the cam c. When it reaches the latter earn, the threading of the blank is completed, and the spring returns the lever to its former position, whereby the chucks J J are withdrawn from the chuck J far enough to admit of afree discharge of the threaded cap K, and remain in their expanded position until the lever again reaches the cam e for closing them. Each shaft D is provided with a clutch, O, for throwing the pinion E in and out of gear with the ring G, so as to prevent its revolutions when not required to be in motion, the clutch being operated by means of the lever M ,which is actuated by the cam c on the arch N, the lever being attached at its tail end to the spring (1, for drawing it back after reaching the return-cam c.

B is a shaft at the front side of the machine, which is provided with pedestals A A Itis connected with the driving-shaft B by means of the pulley H and H and belt I. I

P is an endless chain, which passes over the sprocket-wheel Q on the shaft B, as seen in Figs. 3 and 9, and in practice in front of the machine, over a shaft provided with a pulley, which shaft and pulley are not seen in the drawings. 'The chain is provided with buckets It, for conveying blanks K to the hoppers I R,which are fast on the disk 0. The bottom of the buckets have slots f, through which the fingers g of the hopper pass, as hereinafter described in the transfer of the blanks K from the buckets. The disks have openings in line with the chucks J, through which the blanks K are pushed upon the latter. The hoppers R are provided with plungers S and S, the former being of tubular form, and the latter having longitudinal movements therein. There is acam, e, on the arch N for giving a forward movement to the plunger S for pushing the blanksKupon the chucks J to be threaded, and a cam, 6 on the arch N, for giving a forward movement to the plunger S for holding the blank while the plunger S is withdrawn previously to the threading thereof. The plunger S is withdrawn by means of the spring dflwhich surrounds it, between the hopper It and the collar h, as the tail end of the plunger slides over the receding cam e; and the plunger S is withdrawn by means of the spring d between said collar and the bead on its tail end as the end of the plunger slides against the receding cam 0 There is a stripper, T, in each shaft D, as represented in Fig. 7 ,which discharges the threaded cap K as the plunger S is withdrawn, the stripper being forced forward by means of the spring (1".

The operation of the machine is as follows: The central shaft, B, which carries the faceplate 0 and disks 0, O and C and connected devices, being revolved as described, the blanks K are placed in the buckets R in succession as the endless chain 1? is propelled, and are brought to the hoppers R in succession, and delivered upon the fingers g, as seen in Fig. 9; and the plate 0, revolving in the direction of the arrows, the fingers in passing through the slots f of the buckets draw the blanks into the hoppers; and the plunger S of each hopper being pushed forward by the cam c", as above described, pushes the blank onto the chuck J, and at the same time the cam e forces the plunger S forward, which holds the blank in position, while the plunger S is withdrawn out of the way; ant the chucks J J being closed upon the blank, the said chucks and the chuck J revolve in opposite directions, as above described, and thread the blank.- The chucks J J are then withdrawn from the threaded cap, and it is discharged by means of the stripper T, the spring cl pushing it forward, and the spring (Z of the plunger S yield ing as the end of the plungenrod passes over the receding cam c. The cap is thus held between the stripper T and plunger S in their outward movement, and is thereby gradually discharged, so as to pass gently from the chuck J. 4

I claim as my invention 1.- The combination of the central revolving shaft, B, face-plate G, and disks G, C, and G 0 carrying the hoppers R, shafts D D D,- and pairs ofshafts D, having chucks J J J, the said shaft B being revolved by means of the drivingshaft B, having a pinion, E, geared into teeth of the face-plate G, or by other suitable mechanism, substantially as described.

2-. In-a screw-threading machine having a central revolving shaft, B,provided with afaceplate, 0, disks 0 C G, and shafts D, having chucks J at one end and pinions E at the other end, the combination therewith of stationary rim G, having internal gear-teeth for revolving the said shafts D, substantially in the manner and for the purpose set forth. v

3. The combination of series of shafts D and D, having threaded chucksJ and J J respectively, the shafts being geared together by means of pinions E and E, respectively, whereby the chucks J J are caused to revolve in opposite direction to the chuck J, for threading sheetmetal blanks, substantially as described.-

4. In a screw-threading machine having pairs of shafts D, provided with chucks J J, and central shafts, D, havin'gchucks J, the combination,with said shafts D, of universal joints L, to admit of the shafts D being moved from and toward the shafts D to produce a like movement of the chucks J, toward and from the chucks J, substantially in the manner and for the purpose set forth.

5. The combination of eccentrics F F, haying Wheels G G, with the shafts D D, and with the shaft D, having a pinion, E, the wheels G G being pivoted to the face-plate G for moving the chucks J J toward and from the chuck J, substantially as described.

6. The hoppers R, having fingers g, in combination with the revolving disk 0, and endless chain P, "having buckets R, with slots fin their bottoms, substantially in the manner and for the purpose set forth.

WVILLIAM \VERTS.

-Witnesses THOMAS J. BEWLEY, STEPHEN USTIOK. 

